Subheading 4907 00
Unused postage, revenue or similar stamps of current or new issue in the country in which they have, or will have, a recognised face value; stamp-impressed paper; banknotes; cheque forms; stock, share or bond certificates and similar documents of title

49070010 - Unused, postage, revenue - Nomenclature Id. Number

Unused postage, revenue or similar stamps of current or new issue in the country in which they have, or will have, a recognised face value

Can be used for an export declaration.
Combined Nomenclature, Nomenclature Id. Number
(TARIC)